Lord Zardoz said:
1) What triggered the Revolt
2) What form did the Revolt take
3) What was the fallout
I've had a couple of these recently.
HERO 5e
1) The GM decided to "take the game evil" (by going into an alternate universe where the previously good characters were evil), allegedly because "the players wanted it" - when, in fact, all of one player wanted it, and the others all wanted to play good guys with a minor flaw.
2) I discussed it with the GM out of game and decided to write my character out and walk; the campaign broke up when the others played out the next session and, lo, only one wanted to go evil in that manner. :\
3) The campaign died, the GM started another (this time Exalted) and many of the same players were in it.
D&D 3.5
1) My character had been paralyzed; the asked me if I wanted to control a boss (I did), let me play out an encounter (in which I had to restrain myself from TPKing the rest of the PCs), misunderstood the situation and had me make a silly move; the next session, he 'corrected' that silly move by using a balor (the PCs, mind, were all ECL 3 or 4).
2) I told the GM I would either walk or exploit an infinite loop next level (bizarrely, I actually had an in-character justification for the latter

) if the use of a balor in this way stood, because it completely deprotagonized the PCs just to, in effect, retcon to the result the GM wanted but screwed up in the previous session. I would have simply walked, but this GM was a first-timer and I wanted to give him a shot. The rest of the players agreed.
3) The GM retconned back to the encounter where I ran the boss, and we'll proceed from there.